TAPPI T218 sp-06

TAPPI T218 sp-06

Click here to purchase
This standard practice describes the calibration of standards for hemispherical reflectance in relation to the theoretically perfect reflecting diffuser with an assigned value of unity.The calibration of an instrument standard is made by means of a standard coated flat plate.The absolute reflectance of the flat plate is determined with a spectrophotometer equipped with an integrating sphere to which has been added an auxiliary sphere.The flat plate is coated at the same time, and in the same manner as, the interior of the auxiliary sphere, so that it is essentially a flat segment of the sphere’s interior surface. The flux reflected from the interior of the auxiliary sphere through its port is compared with that reflected from the flat plate. The absolute or total diffuse reflectance of the flat plate is calculated by comparing the two reflected fluxes and the ratio of the port area to the wall area of the sphere.

Product Details

Published:
01/01/2006
Number of Pages:
6
File Size:
1 file , 140 KB

You may also like

TAPPI T275 sp-23

TAPPI T275 sp-23

Screening of pulp (Somerville-type equipment)standard by Technical Association of the Pulp and Paper Industry, 06/01/2023

TAPPI TIP 0402-32

TAPPI TIP 0402-32

Guidelines for Thermal Spray Coatings Installed to Prevent Corrosion in Pulp Mill Process Equipmentstandard by Technical Association of the Pulp...

TAPPI T271 om-23

TAPPI T271 om-23

Fiber Lenth of Pulp and Paper by Automated Optical Analyzer Using Polarized Lightstandard by Technical Association of the Pulp and...

TAPPI T 551 om-23

TAPPI T 551 om-23

Thickness of Paper and Paperboard (Soft Platen Method)standard by Technical Association of the Pulp and Paper Industry, 06/01/2023

Back to Top